bpf: return VMA snapshot from task_vma iterator

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53084
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:22 UTC
Updated2026-07-14 15:26:52 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: return VMA snapshot from task_vma iterator Holding the per-VMA lock across the BPF program body creates a lock ordering problem when helpers acquire locks that depend on mmap_lock: vm_lock -> i_rwsem -> mmap_lock -> vm_lock Snapshot the VMA under the per-VMA lock in _next() via memcpy(), then drop the lock before returning. The BPF program accesses only the snapshot. The verifier only trusts vm_mm and vm_file pointers (see BTF_TYPE_SAFE_TRUSTED_OR_NULL in verifier.c). vm_file is reference- counted with get_file() under the lock and released via fput() on the next iteration or in _destroy(). vm_mm is already correct because lock_vma_under_rcu() verifies vma->vm_mm == mm. All other pointers are left as-is by memcpy() since the verifier treats them as untrusted.

Risk And Classification

EPSS: 0.001560000 probability, percentile 0.051980000 (date 2026-07-14)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4ac4546821584736798aaa9e97da9f6eaf689ea3 83b8802c034e843b83a3e1ef6f30cdd4e9ec291c git Not specified
CNA Linux Linux affected 4ac4546821584736798aaa9e97da9f6eaf689ea3 592226d138378601ae28eb890e2bbc23ec3600f7 git Not specified
CNA Linux Linux affected 4ac4546821584736798aaa9e97da9f6eaf689ea3 13860ca37b8df0b856ee1ce3bdbd7c327d5f53e8 git Not specified
CNA Linux Linux affected 4ac4546821584736798aaa9e97da9f6eaf689ea3 4cbee026db54cad39c39db4d356100cb133412b3 git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4cbee026db54cad39c39db4d356100cb133412b3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/592226d138378601ae28eb890e2bbc23ec3600f7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/83b8802c034e843b83a3e1ef6f30cdd4e9ec291c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/13860ca37b8df0b856ee1ce3bdbd7c327d5f53e8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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